Replace hot supply line

Discussion in 'Water Heater Forum, Tanks' started by n2learning, Mar 14, 2010.

  1. n2learning

    n2learning New Member

    Messages:
    21
    Location:
    Missouri
    Gas WH currently has 1/2" hot supply line. Cold supply is 3/4".
    I want to replace 1/2" with 3/4".

    Can you add anything (or correct) the steps I need to take:

    1) shut off water from main or valve going to WH
    2) turn off gas going into WH
    3) empty hot water by turning on lowest fixture in home
    4) do I also need to drain the WH with a hose running to a floor drain?
    5) solder new copper pipe w/ 3/4"...and also add a heat trap.
    6) turn everything back on and check for leaks
  2. jc60618

    jc60618 DIY Junior Member

    Messages:
    88
    Location:
    Chicago
    I install a union fitting on both hot and cold lines. Also dont forget to use the proper transition between different metals. There are different methods do do this some examples are; dielectric unions, dielectric nipples, brass nipple or stainless steel nipple.
  3. n2learning

    n2learning New Member

    Messages:
    21
    Location:
    Missouri
    I think I will leave the unions alone, although they do look pretty corroded.

    Is there anyting else I should do other than replacing the female adapter from the nipple (shown in the image) and soldering new 3/4" pipe?

    [​IMG]
  4. jc60618

    jc60618 DIY Junior Member

    Messages:
    88
    Location:
    Chicago
    You should be ready to go. However I would first pre fab the female adapter into a small piece of pipe, let it cool and then install it. Also use teflon tape and pipe dope on the threads.
  5. n2learning

    n2learning New Member

    Messages:
    21
    Location:
    Missouri
    Good call. Thanks!
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